You need to use CSS3 transparency and the Gradient function at the same time.
something like css:
.gradient{ background-image: -webkit-gradient( linear, center center, left center, from(rgba(255, 255, 255, 1.0)), to(rgba(255, 255, 255, 0)) );
see this fiddle (it includes support for all browsers. Not sure about IE because I don't have one :))
user2354869
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